Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add ognjengt/founder-skills --skill cro-optimizationgit clone --depth 1 https://github.com/ognjengt/founder-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/ognjengt/founder-skills/cro-optimization)<a href="https://agentmods.dev/skills/ognjengt/founder-skills/cro-optimization"><img src="https://agentmods.dev/badge/skills/ognjengt/founder-skills/cro-optimization.svg" alt="Measured on agentmods" height="20"></a>- Socket pass
- Snyk warn
- NVIDIA SkillSpector pass
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00065 | $0.02131 |
| Opus 5 | $0.00032 | $0.01066 |
| Sonnet 5 | $0.00013 | $0.00426 |
| Haiku 4.5 | $0.00006 | $0.00213 |
Grade A, and why
cro-optimization scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 8d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 303 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CRO Optimization
Purpose
Analyze a landing page and deliver a comprehensive CRO audit with specific, actionable recommendations to maximize conversions.
Execution Logic
Check $ARGUMENTS first to determine execution mode:
If $ARGUMENTS is empty or not provided:
Respond with: "cro-optimization loaded, provide your landing page URL or paste your HTML/CSS code"
Then wait for the user to provide their landing page in the next message.
If $ARGUMENTS contains content:
Proceed immediately to Task Execution (skip the "loaded" message).
Task Execution
When landing page is available (either from initial $ARGUMENTS or follow-up message):
1. MANDATORY: Read Reference Files FIRST
BLOCKING REQUIREMENT — DO NOT SKIP THIS STEP
Before doing ANYTHING else, you MUST use the Read tool to read ALL three reference files:
Read: ./references/cro_principles.md
Read: ./references/landing_page_patterns.md
Read: ./references/element_audit_framework.md
What you will find:
- cro_principles.md: 13 core CRO principles with detection criteria and fix patterns
- landing_page_patterns.md: Real patterns from high-converting pages (ClickUp, Notion, Stripe, Apple, etc.) organized by category
- element_audit_framework.md: Systematic framework for auditing HTML elements, CTAs, forms, and visual hierarchy
DO NOT PROCEED to Step 2 until you have read all files and have the principles, patterns, and audit framework loaded in context.
2. Check for Business Context
Check if FOUNDER_CONTEXT.md exists in the project root.
- If it exists: Read it and use the business context to personalize recommendations (industry, target audience, product type, competitors).
- If it doesn't exist: Proceed with analysis based on page content alone.
3. Fetch and Extract Landing Page
If user provided a URL:
- Use WebFetch to retrieve the landing page content
- Extract and catalog key elements (see Element Extraction below)
If user provided HTML/CSS directly:
- Analyze the provided code directly
- Note any missing context (live styling, images, etc.)
What ships with it
4 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 8d ago First seen · 303 lines · 65 tokens per session scan A 258040a0a423
cro-optimization is a skill published in the GitHub repository ognjengt/founder-skills (293 stars, last pushed 3mo ago), licensed MIT. It adds 65 tokens to every session and 2,131 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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